WhenI count the number of stitches indicated by reading the pattern it does not come to 87, can you see what I mean?,

It really does come out to 87sts. You start with 75 and there's an increase of 12sts to 87sts. Remember that when it says to increase in the next stitch, that uses one stitch and leaves you with 2sts. Also, as Sue mentioned the repeat is 3 times total.
How many sts do you come out with when you count the row and maybe we can figure out where you're making a mistake?